I first downloaded its trial version to see if it could help me recover my lost data from my crashed ext drive, that was unplugged in the process of my backup. I ran a detailed scan of the disk drive, but the result is disappointing, for I don't see any files that I want to retrieve in the list, but it made the drive show up on the drive list again. Then I did a detailed scan again, then the result showed my lost files in the list. I don't know why, but that's ok, I decided to pay for its paid version. P.S. I ever tried to use this program to recover my GoPro camera, not work. It can scan out the files but all are in black, no real date could be retrieved.